I'll trust the coaches on this. If they don't think Brad is quite ready, then go with Ryan. Don't go with Ryan because he is the easy choice though. He has certainly had more experience, but we have also seen his limitations.
I would like to see a heavy does of Brad, with a little Ryan sprinkled in to keep the defense guessing. If Keaton isn't 100%, but can still play, maybe we start Keaton, but sprinkle Brad into the mix. The thing with Brad is defenses won't have much to go off of. That being said, he can't be throwing ducks up either. That grab by Wanzek was a very heads up play. Even more vital to get the run game going, and going early this week.